玉柴CNG单燃料发动机系统组成及工作原理CHN-ENG

1、玉柴机器股份有限公司玉柴机器股份有限公司 Yuchai Machinery Co. Ltd.http：玉柴玉柴CNGCNG发动机培训发动机培训YuchaiYuchai CNG Engine Training CNG Engine Training 玉柴玉柴CNG发动机工作原理发动机工作原理 Basic Operating Principle of Yuchai CNG Engine 第一部分Section One CNGCNG发动机工作原理图发动机工作原理图 CNG Engine Working Theory Diagram CNGCNG发动机的工作原理发动机的工作原理 CNG Engine

2、Working Theory 高压的压缩天然气从储高压的压缩天然气从储气钢瓶出来，经过天然气滤气钢瓶出来，经过天然气滤清器过滤后，经高压电磁阀清器过滤后，经高压电磁阀进入高压减压器，高压减压进入高压减压器，高压减压器的作用是将高压的压缩天器的作用是将高压的压缩天然气（工作压力然气（工作压力200bar-30bar）经过减压加热将压力）经过减压加热将压力调整至调整至7bar-9bar。高压天然。高压天然气在减压过程中由于减压膨气在减压过程中由于减压膨胀，需要吸收大量的热量，胀，需要吸收大量的热量，为防止减压器结冰，须用发为防止减压器结冰，须用发动机冷却液在减压器里对燃动机冷却液在减压器里对燃气进

3、行加热。气进行加热。 Highly compressed natural gas from the NG tank enters through the high-pressure lockoff valve into the high pressure regulator after being filtered in the natural gas filter. The opening/closing of the high-pressure lockoff valve is controlled by the ECM. The high pressure regulator is us

4、ed to decompress and heat the initial highly compressed natural gas (working pressure30200bar) into the pressure range of 79bar. High-pressure natural gas absorbs a large amount of heat during the decompression process due to pressure relief and expansion. In order to prevent the high pressure regul

5、ator from being frozen, the engine coolant is delivered to the high pressure regulator and used to heat the natural gas. CNGCNG发动机的工作原理发动机的工作原理 CNG Engine Working Theory 经减压后的天然气进入经减压后的天然气进入电控调压器电控调压器(EPR)，电控调压，电控调压器的作用是根据发动机运行器的作用是根据发动机运行工况精确控制天然气供给量。工况精确控制天然气供给量。天然气与空气在混合器内充天然气与空气在混合器内充分混合，进入发动机缸内

6、，分混合，进入发动机缸内，经火花塞点燃进行燃烧，火经火花塞点燃进行燃烧，火花塞的点火时刻由花塞的点火时刻由ECM控制，控制，氧传感器即时监控燃烧后的氧传感器即时监控燃烧后的尾气的氧浓度，计算出空燃尾气的氧浓度，计算出空燃比，比，ECM根据氧传感器的反根据氧传感器的反馈信号及时修正天然气供给馈信号及时修正天然气供给量。量。 Decompressed natural gas goes into the electronic pressure regulator, which is used to precisely control the natural gas injection amount

7、according to the actual engine working conditions. Natural gas is sufficiently mixed with air in the mixer and then enters into the engines cylinders for spark ignition. The sparks ignition timing is controlled by the ECM. The oxygen sensor monitors the oxygen concentration of the exhaust produced a

8、fter combustion instantaneously and calculates the air-fuel ratio and then the ECM corrects the natural gas injection amount in time according to the feedback signals from the oxygen sensor. 增压器提供一个和发动机负荷相应的可变的进增压器提供一个和发动机负荷相应的可变的进气增压压力气增压压力,而增压器的废气旁通阀可以通过释而增压器的废气旁通阀可以通过释放涡轮处的排气压力来减小增压压力。这通过放涡轮处的排气压

9、力来减小增压压力。这通过一个膜片推动杠杆来完成。当压力提供给膜片一个膜片推动杠杆来完成。当压力提供给膜片时时,杠杆移动去打开废气旁通阀。杠杆移动去打开废气旁通阀。ECI系统利用系统利用废气旁通控制阀来控制到废气旁通阀执行器的废气旁通控制阀来控制到废气旁通阀执行器的压力。压力。The turbo-charger provides an intake air pressure change correlating with the load of the engine. The waste gate on the turbocharger is designed to dump exhaust p

10、ressure around the turbine to reduce boost. This is done with a diaphragm operated lever. When pressure is applied to the diaphragm, the lever moves to open the waste gate. The ECI system is designed to control the pressure to the waste gate actuator with the Waste Gate Pressure control valve. 增压压力的

11、控制增压压力的控制Turbo-Charger Control 废气旁通控制阀的安装用来阻止压力到废气旁废气旁通控制阀的安装用来阻止压力到废气旁通阀执行器。提供给废气旁通控制阀的压力应通阀执行器。提供给废气旁通控制阀的压力应该在该在2225psig之间。废气旁通控制阀有一个之间。废气旁通控制阀有一个压力传感器监控着到执行器的压力，它根据压力传感器监控着到执行器的压力，它根据ECM计算出来的计算出来的WGP命令大小，或者释放或命令大小，或者释放或者把压力送到执行器。者把压力送到执行器。The Waste Gate control valve is installed so that it inte

12、rrupts the pressure to the waste gate actuator. The supply pressure should be between 22 and 25 psig. It has a pressure sensor that monitors the pressure to the actuator and either releases or sends pressure to actuator depending on what the WGP command calculated by the ECM is. 增压压力的控制增压压力的控制Turbo-

13、Charger Control ECM接收到一个带有接收到一个带有IVS的油门踏板传来的代表负载命令的可变电压的油门踏板传来的代表负载命令的可变电压信号信号,它然后将这个位置命令其转换成一个负荷百分比命令。因为它然后将这个位置命令其转换成一个负荷百分比命令。因为ECM使用负载命令使用负载命令,然后计算出要达到此负荷需要的然后计算出要达到此负荷需要的MAP目标和目标和TIP目目标。标。 The ECM receives its load command from a variable voltage signal through a foot pedal sensor with IVS. It

14、then translates this position command into a load percentage command. Because the ECM uses load command, it calculates two targets to achieve this objective; a MAP target and a TIP target. 负荷的控制负荷的控制Load Control 当发动机的负载朝当发动机的负载朝MAP目标升高时目标升高时,电子节气门开度和废气旁通阀开电子节气门开度和废气旁通阀开度不断调整使度不断调整使MAP压力值达到压力值达到MAP目标

15、。然后电子节气门再进行调整，目标。然后电子节气门再进行调整，使电子节气门前后的压差达到目标值，在调整节气门的过程中不断调使电子节气门前后的压差达到目标值，在调整节气门的过程中不断调整废气旁通阀的开度，保持整废气旁通阀的开度，保持MAP压力值和目标值一致。压力值和目标值一致。 As the engine increases in load towards the MAP target, the throttle and WGP control valve adjust so that the MAP pressure meets the MAP target. The throttle then

16、 adjusts again so that the pressure drop across the throttle (delta P command) is met, while maintaining the MAP target (adjusting boost through the WGP).负荷的控制负荷的控制Load Control 电控调压器电控调压器(EPR)是通过一个微处理器控制的是通过一个微处理器控制的高速大马力电机驱动的压力调节器。高速大马力电机驱动的压力调节器。EPR里里的微处理器通过的微处理器通过CAN通讯接收到从通讯接收到从ECM传来传来的燃料压力指令（的燃料

17、压力指令（EPR燃料出口压力和混合燃料出口压力和混合器入口处的空气压力之差），并将器入口处的空气压力之差），并将EPR内的内的信息传回给信息传回给ECM。The Electronic Pressure Regulator (EPR) is a pressure regulator that is driven by a microprocessor-controlled high powered/fast acting actuator. The microprocessor in the EPR receives pressure commands from the ECM over a C

18、AN network link and relays information about the state of the EPR back to the ECM.燃料的控制燃料的控制Fuel Control 然后然后EPR内的电机驱动调压器内膜片来调整内的电机驱动调压器内膜片来调整EPR出口压差值，使这个压差满足出口压差值，使这个压差满足ECM指令指令要求。要求。 The actuator of the EPR will then drive the diaphragm of the regulator to adjust the fuel pressure to the mixer so

19、that the actual delta P matches the delta P command from the ECM. 燃料的控制燃料的控制Fuel Control CNG发动机燃气系统组成发动机燃气系统组成 The Composing of Electronic Control Fueling System of Yuchai CNG Engine 第二部分Section Two高压燃料切断阀：高压燃料切断阀：工作原理：由线圈驱动阀芯，由工作原理：由线圈驱动阀芯，由ECM控制其开合，停机状态下处于控制其开合，停机状态下处于常闭状态。常闭状态。作用：及时切断或恢复燃料供给。作用：及

20、时切断或恢复燃料供给。安装要求：为有效防止高压燃料切安装要求：为有效防止高压燃料切断阀的进气接头与高压燃料切断阀断阀的进气接头与高压燃料切断阀结合部位漏气，安装该接头时，必结合部位漏气，安装该接头时，必须使用螺纹密封胶，并且锁紧接头须使用螺纹密封胶，并且锁紧接头使铜垫略有变形，有效密封。使铜垫略有变形，有效密封。High Pressure Lockoff Valve ：Operating principle: The core of the High Pressure Lockoff Valve is driven b y t h e c o i l a n d t h e v a l v e

21、 s opening/closing is controled by the ECM. The High Pressure Lockoff Valve is always in the closed position in the un-working condition of the engine.Purpose: Timely cut off or resume fuel supply. Installation requirements: In order to effectively prevent the natural gas leakage from the joint betw

22、een the high-pressure lockoff valve and its intake pipe end, use a screw sealant for pipe end installation and tighten the pipe end so as to slightly deform the copper washer for effective seal. The inlet and outlet should be differentiated during installation.高压减压器高压减压器:工作原理：通过压力膜片克服弹簧阻力，带动工作原理：通过压

23、力膜片克服弹簧阻力，带动杠杆，调整节流孔的流通面积，从而控制减压杠杆，调整节流孔的流通面积，从而控制减压后的天然气压力。后的天然气压力。 作用：通过节流和加热，使高压的压缩天然气作用：通过节流和加热，使高压的压缩天然气减压至减压至7bar-9bar的低压天然气。的低压天然气。 HighPressure Regulator :Operating principle: Employs the Pressure diaphragm to overcom the spring resistance and then to drive the lever and adjust the flow area

24、 of the throttle orifice, thus to control the natural gas pressure that has been decompressed.Purpose: Decompress the highly compressed natural gas to 79 bar by means of throttling and heating.高压减压器高压减压器:安装要求：安装要求：1）减压调节器必须安装在汽车（底盘）减压调节器必须安装在汽车（底盘）大梁上。设计减压调节器支架时，应注意减压调节大梁上。设计减压调节器支架时，应注意减压调节器的安装位置不能

25、高于发动机散热器顶部。否则会器的安装位置不能高于发动机散热器顶部。否则会导致加热水不能流经减压器，导致减压器结冰冻导致加热水不能流经减压器，导致减压器结冰冻裂裂 ；2）竖直安装且接反馈管一端朝上；）竖直安装且接反馈管一端朝上；3）进气）进气接头螺纹部分必须使用螺纹密封胶，并且使用铜垫接头螺纹部分必须使用螺纹密封胶，并且使用铜垫进行密封。进行密封。 High Pressure Regulator :(Installation requirements)the high pressure regulator must be installed on the vehicles crossbeam (

26、 chassis ). The high pressure regulator bracket shall be designed to make the high pressure regulator s installation position lower than the top of the engine radiator. Otherwise, the heating water will be unable to flow through the high pressure regulator, resulting in its frost crack. It must be i

27、nstalled vertically and the end with a pressure feedback pipe connecting the intake pipe must be upwards. It is necessary to use the screw sealant and copper washer to seal the screw thread of the high pressure regulators intake connector.低压燃料切断阀：低压燃料切断阀：工作原理：由线圈驱动阀芯，由工作原理：由线圈驱动阀芯，由ECM控制其开合，停机状态下处于控

28、制其开合，停机状态下处于常闭状态。常闭状态。作用：及时切断或恢复燃料供给。作用：及时切断或恢复燃料供给。安装要求：为有效防止低压燃料切安装要求：为有效防止低压燃料切断阀进气接头与低压燃料切断阀结断阀进气接头与低压燃料切断阀结合部位漏气，安装该接头时，必须合部位漏气，安装该接头时，必须使用螺纹密封胶，并且锁紧接头使使用螺纹密封胶，并且锁紧接头使铜垫略有变形，有效密封。铜垫略有变形，有效密封。High Pressure Lockoff Valve ：Operating principle: The core of the High Pressure Lockoff Valve is driven

29、b y t h e c o i l a n d t h e v a l v e s opening/closing is controled by the ECM. The High Pressure Lockoff Valve is always in the closed position in the un-working condition of the engine.Purpose: Timely cut off or resume fuel supply. Installation requirements: In order to effectively prevent the

30、natural gas leakage from the joint between the high-pressure lockoff valve and its intake pipe end, use a screw sealant for pipe end installation and tighten the pipe end so as to slightly deform the copper washer for effective seal. The inlet and outlet should be differentiated during installation.

31、 电控调压器部件 :工作原理：该零件内部有一控制芯片，该控制芯片接受来自ECM的控制指令，通过高速电磁阀控制天然气气量，从而实时有效控制空燃比。作用：控制天然气供给量。 Electronic Pressure Regulator (EPR Valve) :Operating principle: The control core inside this part that receives commands from the ECM effectively controls the air-fuel ratio through using the high-speed lockoff valv

32、e to control the natural gas flow.Purpose: To control the natural gas supply amount. 混合器混合器:工作原理及作用：将天然气和中冷后的工作原理及作用：将天然气和中冷后的空气充分混合，使燃烧更充分、柔和。空气充分混合，使燃烧更充分、柔和。有效降低有效降低NOx排放和排气温度。排放和排气温度。安装要求：调压器出气管安装在混合器安装要求：调压器出气管安装在混合器天然气入口处，安装时锥螺纹部分必须天然气入口处，安装时锥螺纹部分必须使用螺纹密封胶以防止漏气。使用螺纹密封胶以防止漏气。 Mixer :Operating p

33、rinciple and purpose: To fully mix the natural gas and the intercooled air for sufficient and mild combustion and to effectively reduce the emitted NOx amount and the exhaust temperature.Installation requirements: The pressure regulators outtake pipe shall be installed at the natural gas intake of t

34、he mixer; when in installation, the taper thread portion shall be sealed by means of screw sealant for preventing leakage. 电子节气门电子节气门:工作原理及作用：通过控制蝶阀的开度，控制进入工作原理及作用：通过控制蝶阀的开度，控制进入缸内的混和气的量，从而控制发动机的转速和负荷。缸内的混和气的量，从而控制发动机的转速和负荷。驾驶者通过油门踏板，将动力需求传送给驾驶者通过油门踏板，将动力需求传送给ECM，ECM接收到油门踏板信号后，根据发动机运行工况接收到油门踏板信号后，根据

35、发动机运行工况控制电子节气门开度。控制电子节气门开度。 通过控制蝶阀开度，控制怠通过控制蝶阀开度，控制怠速转速和调速特性曲线。速转速和调速特性曲线。安装要求：安装电子节气门时，驱动电机轴线必须安装要求：安装电子节气门时，驱动电机轴线必须保持水平方向。保持水平方向。 Electronic Throttle Body :Operating principle and purpose: Employed to control the amount of the mixture entering into the cylinder by controlling the valves opening,

36、thus controlling the speed and the load of the engine. The driver delivers the power request through the foot pedal to the ECM and then the ECM controls the electronic throttle bodys opening according to the engines actual working conditions after receiving the foot pedal signal. The idle speed and

37、speed regulation characteristic curve can be controlled by the controling of the valves opening.Installation requirements: When installing the electronic throttle body, the axial line of the driving motor shall be kept horizontal. 电控模块电控模块:作用：电控作用：电控CNG发动机管理核心，通过各种传感发动机管理核心，通过各种传感器监控发动机运行工况，并根据发动机运行

38、工况器监控发动机运行工况，并根据发动机运行工况和控制和控制MAP控制各执行器。控制各执行器。 工作环境：工作环境：1）温度：（）温度：（-40-105） 2）最大震动：）最大震动：8G10-1000HZ 工作电压：工作电压：16-32 V DC安装要求：要有可靠的防水、防油、散热措施。安装要求：要有可靠的防水、防油、散热措施。 Engine Control Module(ECM) :Purpose: Being the management core of the CNG engine, the engine control module (ECM) monitors the engines

39、working conditions by different sensors, and controls the actuators according to the engine working conditions and the controling MAP .Working environment: Temperature: -40+105; Max. vibration: 8G(101000) HZ; Working voltage: 1632V DCInstallation requirements: The ECM shall be installed at a positio

40、n as well as with reliable waterproof, oilproof and heat radiation measures provided. 废气旁通控制阀废气旁通控制阀:工作原理及作用：通过控制工作原理及作用：通过控制废气旁通控制阀的占空比，废气旁通控制阀的占空比，控制废气旁通控制阀的出口控制废气旁通控制阀的出口压力，从而控制发动机的增压力，从而控制发动机的增压压力。采用该技术能有效压压力。采用该技术能有效提升发动机低速扭矩及动力提升发动机低速扭矩及动力响应性，满足公交车频繁起响应性，满足公交车频繁起步的工作要求！步的工作要求！Waste Gate Contro

41、l Valve :Operating principle and purpose: To control the waste gate control valves outtake pressure by controlling its duty ratio, thus c o n t r o l l i n g t h e e n g i n e s supercharging pressure. This technology can effectively increase the engines low-speed torque so as to meet the busoperati

42、ng requirements incurred due to frequent starting! 防喘振阀防喘振阀:作用：作用： 当发动机突然减速时当发动机突然减速时 ，通过喘振阀通气软管，通过喘振阀通气软管将节气门后的低压压力传递到防喘振阀压力反馈接头将节气门后的低压压力传递到防喘振阀压力反馈接头上，打开喘振阀单向截止膜片，使增压器压气机前后上，打开喘振阀单向截止膜片，使增压器压气机前后压力平衡，避免增压器喘振，保护增压器。压力平衡，避免增压器喘振，保护增压器。安装要求：该零件共有三个接口。通过喘振阀通气软安装要求：该零件共有三个接口。通过喘振阀通气软管连通防喘振阀和进气管压力，另外两个

43、管连通防喘振阀和进气管压力，另外两个25外径的外径的接口分别连接压气机前进气管和压气机后进气管。接口分别连接压气机前进气管和压气机后进气管。Surge Valve :Purpose: When the engine speed suddenly drops, the surge valves ventilation hose delivers the low pressure at the rear of the throttle to its pressure feedback connector and then this action opens its one-way stop dia

44、phragm to ensure the balanced pressures in front of and behind the supercharger compressor, so as to protect the supercharger from surging.Installation requirements: This part has three interfaces in total. The surge valve is connected with the intake pipe through the surge valves ventilation hose;

45、the other two interfaces with the diameter of 25 are connected respectively to the superchargers front and rear intake pipes. 点火线圈点火线圈:作用：作用： 接收来自接收来自ECM点火指令，产生高电压并将高电压点火指令，产生高电压并将高电压传递给火花塞，产生火花，点燃天然气。点火线圈能根据传递给火花塞，产生火花，点燃天然气。点火线圈能根据ECM指令控制点火时刻，使发动机实现低排放、低气耗。指令控制点火时刻，使发动机实现低排放、低气耗。安装要求：安装时拧紧点火线圈安装螺栓

46、，以保证点火线安装要求：安装时拧紧点火线圈安装螺栓，以保证点火线圈胶套内弹簧与火花塞头部紧密接触。安装火花塞和点火圈胶套内弹簧与火花塞头部紧密接触。安装火花塞和点火线圈时，必须在火花塞头部与点火线圈弹簧结合部位涂抹线圈时，必须在火花塞头部与点火线圈弹簧结合部位涂抹导电膏。在胶套与火花塞接触的陶瓷部位应该涂抹绝缘润导电膏。在胶套与火花塞接触的陶瓷部位应该涂抹绝缘润滑油脂，以防止因胶套老化导致火花塞与缸盖之间漏电。滑油脂，以防止因胶套老化导致火花塞与缸盖之间漏电。 Ignition Coil :Purpose: To receive the ignition commands from the E

47、CM, and produce and deliver the high voltage to the spark plugs for spark creation and natural gas ignition. The ignition coils can control the ignition timing according to the commands from the ECM for low emission and low natural gas consumption.Tighten their mounting bolts to ensure that the spri

48、ng within the rubber sleeve of each ignition coil closely contacts the spark plug head. the conductive paste shall be smeared onto the contact portions of the spark plug head and the ignition coil spring when installing the spark plugs and the ignitions coils. Ceramic contact portions of the rubber

49、sleeve and the spark plug shall be smeared with insulative lubricating grease so as to prevent the rubber sleeves from becoming aged, which will lead to electric leakage if aged. 火花塞火花塞:作用：作用： 接收来自点火线圈的高电压接收来自点火线圈的高电压 ，产生火花，点燃，产生火花，点燃天然气。天然气。安装要求：安装时拧紧点火花塞，拧紧力矩：安装要求：安装时拧紧点火花塞，拧紧力矩：(20-40)N.m。拧紧火花塞必须

50、使用专用火花塞套筒。安装。拧紧火花塞必须使用专用火花塞套筒。安装火花塞和点火线圈时，必须在火花塞头部涂抹导电膏。火花塞和点火线圈时，必须在火花塞头部涂抹导电膏。在胶套与火花塞接触的陶瓷部位应该涂抹绝缘润滑油在胶套与火花塞接触的陶瓷部位应该涂抹绝缘润滑油脂，以防止因胶套老化导致火花塞与缸盖之间漏电。脂，以防止因胶套老化导致火花塞与缸盖之间漏电。Spark Plug :Purpose: Receive high voltage from the ignition coil, create spark and ignite the natural gas.Installation requireme

51、nt: Tighten the spark plugs by the specified torque of 30Nm. A special spark plug sleeve shall be used when tightening the spark plugs. the conductive paste shall be smeared onto the contact portions of the spark plug head and the ignition coil spring when installing the spark plugs and the ignition

52、s coils. Ceramic contact portions of the rubber sleeve and the spark plug shall be smeared with insulative lubricating grease so as to prevent the rubber sleeves from becoming aged, which will lead to electric leakage if aged. 电子油门踏板电子油门踏板:作用：驾驶者通过电子油门踏板驱动和控制发作用：驾驶者通过电子油门踏板驱动和控制发动机运行工况，反映驾驶者的实际动力需求。

53、动机运行工况，反映驾驶者的实际动力需求。安装要求：该油门踏板为接触式电子油门踏板，安装要求：该油门踏板为接触式电子油门踏板，安装时注意将油门踏板布置在防油、防水、防安装时注意将油门踏板布置在防油、防水、防电磁干扰条件较好的地方。为防止整车电磁干电磁干扰条件较好的地方。为防止整车电磁干扰影响电子油门踏板传递给扰影响电子油门踏板传递给ECM的信号，要求的信号，要求电子油门踏板至整车接口信号线必须使用屏蔽电子油门踏板至整车接口信号线必须使用屏蔽线，并且屏蔽层要接地牢固可靠。线，并且屏蔽层要接地牢固可靠。Electronic Foot Pedal :Purpose: The driver drives

54、 the engine and controls its working conditions through the electronic foot pedal, which reflects the drivers actual power needs.Installation requirements: The foot pedal is a contact-type and be installed in an oilproof, waterproof and free-of-electromagnetic-interference area.In order to prevent t

55、he entire vehicles electromagnetic interference from influencing the signals from the foot pedal to the ECM, screened wire shall be used as the signal wire from the foot pedal to the vehicle interface and its shielding layer shall be firmly and reliably grounded. 氧传感器氧传感器:作用：通过检测排气中氧分子浓度，从而测量燃烧作用：通过

56、检测排气中氧分子浓度，从而测量燃烧时的空燃比，时的空燃比，ECM根据测量所得的空燃比修正燃气根据测量所得的空燃比修正燃气供给量。供给量。安装要求：要求在离增压器出口或排气弯管下游安装要求：要求在离增压器出口或排气弯管下游35倍排气管直径（大约倍排气管直径（大约250400mm）的地方，焊接）的地方，焊接一个氧传感器安装座，该零件由玉柴提供，汽车厂一个氧传感器安装座，该零件由玉柴提供，汽车厂安装，供安装废气氧传感器（即安装，供安装废气氧传感器（即UEGO_SENSOR）用用.Universal Exhaust Gas Oxygen sensor( UEGO) :Purpose: To detec

57、t the oxygen concentration in the exhaust and accordingly calculate the transient air-fuel ratio which the ECM based to correct the natural gas supply amount ;Installation requirements: Welded a mounting bracket for the universal exhaust gas oxygen sensor (i.e.UEGO_SENSOR) at a place 35 times the ex

58、haust pipe diameter away from the supercharger outtake or the exhaust elbow (downstream).This bracket will be provided by Yuchai Machinery Corporation and the automobile factory is responsible for the installation. 氧传感器氧传感器:氧传感器应安装在排气管远离发动机一侧（不能安氧传感器应安装在排气管远离发动机一侧（不能安装在排气管下方），传感器线束走向应尽量远离发装在排气管下方），传

59、感器线束走向应尽量远离发动机和排气管，并可靠固定；氧传感器不能安装在动机和排气管，并可靠固定；氧传感器不能安装在排气管转弯处；氧传感器在满足前面的要求的情况排气管转弯处；氧传感器在满足前面的要求的情况下尽可能靠近涡轮增压器；如果有排气制动阀，氧下尽可能靠近涡轮增压器；如果有排气制动阀，氧传感器应安放在排气制动阀的下游；氧传感器的安传感器应安放在排气制动阀的下游；氧传感器的安装位置处不能进雨水；氧传感器和发动机之间最好装位置处不能进雨水；氧传感器和发动机之间最好有隔热罩等隔热装置。有隔热罩等隔热装置。Universal Exhaust Gas Oxygen sensor( UEGO) :The

60、universal exhaust gas oxygen sensor shall be installed on the side of the engine with no exhaust pipe (no allowance to install it under the exhaust pipe or at the exhaust elbow) and the sensors wire harness shall be firmly fixed and be away from the engine and the exhaust pipe. On the premise that the a